It was originally developed to treat seizures and is classified as an anti convulsant. It inhibits voltage gated sodium channels in neurons and therefore reduces electrical signals thought to propagate seizures .
No one knows how it works for mood swings. They think that decreasing electrical activity in the brain prevents mood swings but they’re not quite sure how, so it’s not surprising you’re asking questions about it. All they know is that in trials compared with placebo, it seems to help people feel better.
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